LOGIC Logic is a brandch of mathematics that relies more on strong reasoning skills rather than on computational capability The techniques often used are listed below (A) Assume something to be true u.
LOGIC Logic is a brandch of mathematics that relies more on strong reasoning skills rather than on computational capability The techniques often used are listed below (A) Assume something to be true until it is proven otherwise (B) Make a sytematic list so as to scrutinise the given information (C) Make a table or a few tables (D)Sometimes, we can even draw them out! EXAMPLES Four spectators were commenting on the outcome of a 100 _m race David : A came in second and B came in third Sophia : C was in the fourth place and B was in the second place Shane: D finished second and C finished third Jodie: D was in the first place and B was in the third place Only one remark in each comment is true In What position was C? … … … … … … … … … … A policeman detained four suspects for a theft case A : Hey, I didn’t it! B: A did it C: Come on, I was not even there when the case took place D: B did it Only one suspect told the truth Who was the thief? Some years ago, there were Wednesdays and Tuesdays in the month of March ON Which day of the week was 1st August in that year? Stanley wrote a – digit number on a piece of paper and challenged Darrell to guess it All the digits were different Darrell: Is it 4607? Stanley : Two of the numbers are correct but they are positioned wrongly Darrell : Could it be 1385? Stanley : My answer is the same as before Darrell: How about 2879? Stanley : Wow, twoo the numbers are correct and in the right places as well Darrell : 5461? Stanley : None of the digits is correct What was the number? A box contains blue marbles Another two boxes contain only white marbles Label on box A : white marbles Label on box B : blue marbles Label on box C : Box B contains blue marbles Which box contains blue marbles if two of the above labels are mixed up? Andrew, Jolene and Tommy each draws cards from cards numbered 1,2,3,……9 Andrew : The product of all my numbers is 48 Jolene : The sum of all my numbers is 16 Tommy : The product of all my numbers is 63 What is the largest number among Jolene’s cards? What is the 5th number in the 15th row of the number triangle shown below? 10 11 12 13 14 15 ………………………………………………………………………………………… Three girls are talking about their ages : Ashley : I am 12 years old, years Stella’s junior but year older than Melanie Stella : I am not youngest Melanie and I are years apart Ashley is 11 years old Melanie : I am younger than Ashley She is 10 years old Stella is years her senior One of the above three statements made by each girl is incorrect Help them to unscramble this age puzzle A meteorological report shows the following records of a certain number of days It rained 10 times, either in the morning or in the afternoon There were dry afternoons There were 14 dry mornings Each wet afternoon was preceded by a dry morning How many days did the meteorologist record? 10 Among Andy, Kevin and Mathew, one of them is a teacher The other two are a doctor and a policeman, Mathew is older than the policeman Andy and the doctor are not of the same age The doctor is yuonger than Kevin Who is the teacher? 11 Teddy : Both Leon and Peter lied Leon : One of them ( Teddy and Peter) was lying Peter : One of them ( Teddy and Leon) told the truth Who lied? Who told the truth? 12 One of the three ladies, Amanda, Beatrice and Jodie, comes from Town A The other two ladies come from Town D and Town C Jodie is older than the lady from Town B Amanda and the lady from Town C are not of the same age The Lady from Town C is younger than Beatrice Who comes from Town A? 13 A football flew right onto the glass window of the teachers’ Room and shattered it into piece Four probable culprits were called to the Discipline Master’s room for investigation Colin : Jason did it! Jason: David did it! Melvin : Not by me! David : Joson did it! His words cannot be trusted Only one student told the truth Who was the culprit of this act? 14 Alicia, Beatrice, Charles, David , Elaine, Florence, Graham, and Herman are four couples Elaine had attended David’s wedding as a guest Alicia’s husband is a cousin of Herman When Herman went overseas with his spouse, Beatrice, Charles and Elaine each represented their own spouses to see the couple off at the airport Help to match the four couples 15 Four tourists, A,B,C and D, book into a 18 – storey hotel The countries of their origin are China, Germany, Mexico and Egypt The floor number where A is staying is times that of the Mexican’s The Garman stays floors higher than B but lower than the Egyptian The Egyptian stays floors lower than A All the floor numbers of their hotel rooms are even Match A,B,C and D to their countries of origin and the floor numbers of their hotel rooms ... is the largest number among Jolene’s cards? What is the 5th number in the 15th row of the number triangle shown below? 10 11 12 13 14 15 ………………………………………………………………………………………… Three girls are talking... Stella is years her senior One of the above three statements made by each girl is incorrect Help them to unscramble this age puzzle A meteorological report shows the following records of a certain... record? 10 Among Andy, Kevin and Mathew, one of them is a teacher The other two are a doctor and a policeman, Mathew is older than the policeman Andy and the doctor are not of the same age The